论文标题
丘脑超导体的伪造临界点的费米表面转化
Fermi surface transformation at the pseudogap critical point of a cuprate superconductor
论文作者
论文摘要
伪阶段的性质仍然是我们理解铜矿高温超导性的主要障碍。该金属阶段是否由报告的任何破碎的对称性定义，其费米表面的拓扑仍然是一个基本的开放问题。在这里，我们使用角度依赖性磁倍率（ADMR）来测量Cuprate ND-LSCO的费米表面。在临界掺杂$ p^*$的上方 - 在伪随阶段之外 - 我们符合ADMR数据，并提取与角度分辨光发射定量一致的费米表面几何形状。低于$ p^*$ - 在伪随阶段内 - ADMR在质量上有所不同，揭示了费米表面的清晰转换。 $ p^*$的准粒子寿命的变化被排除在于这种转换的原因。相反，我们发现我们的数据与费米表面的重建最一致，而$ q =（π，π）$ wavevector。
The nature of the pseudogap phase remains a major barrier to our understanding of cuprate high-temperature superconductivity. Whether or not this metallic phase is defined by any of the reported broken symmetries, the topology of its Fermi surface remains a fundamental open question. Here we use angle-dependent magnetoresistance (ADMR) to measure the Fermi surface of the cuprate Nd-LSCO. Above the critical doping $p^*$ -- outside of the pseudogap phase -- we fit the ADMR data and extract a Fermi surface geometry that is in quantitative agreement with angle-resolved photoemission. Below $p^*$ -- within the pseudogap phase -- the ADMR is qualitatively different, revealing a clear transformation of the Fermi surface. Changes in the quasiparticle lifetime across $p^*$ are ruled out as the cause of this transformation. Instead we find that our data are most consistent with a reconstruction of the Fermi surface by a $Q=(π, π)$ wavevector.
